fun fact: if you take any number, then subtract by 1 on one side and add by 1 on the other, it results in the same number, minus one.
ex: 8x8=64. 8-1=7 8+1=9 7x9=63
edit: after 116 calculations, I got the mango badge
edit 2: 255 calculations and I'm in 2nd place on the weekly leaderboard now